[llvm-branch-commits] [libcxx] release/19.x: [libcxx] don't `#include <cwchar>` if wide chars aren't enabled (#99911) (PR #106788)

[via llvm-branch-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-libcxx

Author: None (llvmbot)

<details>
<summary>Changes</summary>

Backport ec56790c3b27df4fa1513594ca9a74fd8ad5bf7f

Requested by: @<!-- -->ldionne

---
Full diff: https://github.com/llvm/llvm-project/pull/106788.diff


1 Files Affected:

- (modified) libcxx/include/format (+6-6) 


``````````diff
diff --git a/libcxx/include/format b/libcxx/include/format
index c3f2b45f0f7305..a88b3ef8528e2d 100644
--- a/libcxx/include/format
+++ b/libcxx/include/format
@@ -237,21 +237,21 @@ namespace std {
 #  include <cstdint>
 #  include <cstdlib>
 #  include <cstring>
-#  include <cwchar>
 #  include <initializer_list>
 #  include <limits>
+#  include <locale>
 #  include <new>
 #  include <optional>
+#  include <queue>
+#  include <stack>
 #  include <stdexcept>
 #  include <string>
 #  include <string_view>
 #  include <tuple>
-#endif
 
-#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
-#  include <locale>
-#  include <queue>
-#  include <stack>
+#  if !defined(_LIBCPP_HAS_NO_WIDE_CHARACTERS)
+#    include <cwchar>
+#  endif
 #endif
 
 #endif // _LIBCPP_FORMAT

``````````

</details>


https://github.com/llvm/llvm-project/pull/106788